산처리된 페이스트로 제조한 나노 구조체 TiO2 전극이 염료감응형 태양전지의 효율에 미치는 영향

이재욱; 황경준; 노성희; 김선일; Jae-Wook Lee; Kyung-Jun Hwang; Sung-Hee Roh; Sun-Il Kim

Journal of the Korean Industrial and Engineering Chemistry, Vol.18, No.4, 356-360, August, 2007

Influence of Nanostructured TiO2 Electrode Fabricated with Acid-treated Paste on the Photovoltaic Efficiency of Dye-Sensitized Solar Cells

이재욱 , 황경준¹, 노성희 ¹, 김선일 ^{1, †}

서남대학교 환경화학공학과
¹조선대학교 생명화학공학과

Jae-Wook Lee , Kyung-Jun Hwang¹, Sung-Hee Roh¹, and Sun-Il Kim^{1, †}

Department of Environmental and Chemical Engineering, Seonam University, Namwon, 590-711, Korea
¹Department of Chemical and Biochemical Engineering, Chosun University, Gwangju 501-759, Korea

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초록

나노 다공질 TiO2 전극막, 광 감응형 염료, 전해질 그리고 상대전극으로 구성된 염료감응형 태양전지(Dye-Sensitized Solar Cells, DSSCs)는 최근에 많은 관심을 받아오고 있다. 염료감응형 태양전지에서 TiO2 전극막은 태양광의 흡수량을 증가시키기 위해 가능한 많은 양의 Ru 착물을 표면에 흡착시켜야 하는데 이를 위해 높은 비표면적과 나노 다공성 입자로 구성된 광전극이 요구된다. 또한 에너지 전환 효율을 증가시키기 위한 방법으로 TiO2 페이스트의 제작시 산을 첨가 후 열처리하는 방법이 보고되고 있다. 이 논문에서는 산이 첨가된 페이스트로 제조한 TiO2 광전극이 염료감응형 태양전지의 에너지 변환 효율에 미치는 영향을 체계적으로 이해하기 위해 FE-SEM, XPS, EXAFS 그리고 AFM 등을 이용하여 제조된 광전극의 물리적 화학적 특성을 조사하였다. 또한 광전류-전압 곡선으로부터 산처리된 페이스트를 이용하여 제조한 염료감응형 태양전지의 에너지 전환효율을 평가하였다. 산처리된 페이스는 염료감응형 태양전지의 에너지 전환효율에 크게 영향을 미침을 알 수 있었다.

Recently, dye sensitized solar cells (DSSCs) composed of nanoporous TiO2, light-sensitive dyes, electrolytes, and counter electrode have been received much attention. Nanostructured particles with higher surface area for the higher adsorption of Ru (II) dye are required to increase the quantity of light absorption. Also, it has been reported that the key factor to achieve high energy conversion efficiency in the photoelectrode of DSSC is the heat treatment of TiO2 paste with acid addition. In this work, we investigated the influence of acid treatment of TiO2 solar cell on the photovoltaic performance of DSSC. The working electrodes fabricated in this work were characterized by X-ray photoelectron spectroscopy (XPS), extended X-ray absorption fine structure (EXAFS), field emission scanning electron microscope (FE-SEM), and atomic force microscope (AFM). In addition, the influence of nanostructured photoelectrode fabricated with the acid-treated paste on the energy conversion efficiency was investigated on the basis of photocurrent-potential curves. It was found that the influence of acid-treated paste on the photovoltaic efficiency was significant.

Keywords:dye-sensitized solar cells;TiO2;acid treatment;photoelectrode;I-V curves

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[Related Articles]

[1] O'Regan B, Gratzel M, Nature, 353, 737 (1991)

[2] Gratzel M, Prog. Photovolt. Res. Appl., 8, 171 (2000)

[3] Gregg BA, Chem. Phys. Lett., 258, 376 (1996)

[4] Hao S, Wu J, Fan L, Huang Y, Lin J, Wei Y, Sol. Energy, 76, 745 (2004)

[5] Koo BK, Lee DY, Lee WJ, Kim HJ, J. Korean institute of electrial and electronic material engineers, 17, 1001 (2004)

[6] Myung JJ, Chung YS, Kyong JB, Kim HK, J. Korean Ind. Eng. Chem., 7(4), 794 (1996)

[7] Kalyanasundaran K, Gratzel M, Coordination Chemistry Reviews, 77, 347 (1999)

[8] Gratzel M, J. Photochem. Photobiol., 4, 145 (2003)

[9] Park NG, J. Korean Ind. Eng. Chem., 15(3), 265 (2004)

[10] Toe BK, EXAFS, Principles and Data Analysis, Spring-Verlag, Berlin (1986)

[11] Moudler JF, Stickle WF, Handbook of X-ray Photoelectron Spectroscopy, Perkin-Elmer, Eden Praitie, MN (1992)